Readers Advisory

http://www.scholastic.com/bookwizard
find books based on subject, reading level, and books like...

http://www.mcpl.lib.mo.us/readers/series/juv/

Juvenile Series and Sequels

The 'Juvenile Series and Sequels' database contains over 28,000 books in 3,700 series titles that are classified into three audiences:

http://www.bettendorflibrary.com/bpl-bin/series.pl
Hello and welcome to Bettendorf Public Library's Young Adult Books In Series and Sequels Wiki!

http://ww2.kdl.org/libcat/WhatsNextNEW.asp**Our** What's Next™: Books in Series database
helps you search series fiction.
A series is two or more books linked by character(s),
settings, or other common traits.

Books like Captain Underpants
I was asked to post a hit, and I certainly will! Here are the suggestions:
Lunch Lady series
Snarf Attack, Underfoodle, Secret of Life by Amato
Ricky Ricotta books
Geronimo Stilton books
Kat Kong and Dogzilla by Pilkey
Time Warp Trio series
Zach Proton
Fred & Anthony books by Primavera
Axle Galench
Rotten School books
Diary of a Wimpy Kid series
Bone graphic novels
Underwhere series by Hale
Franny K. Stein series
Journal of a Cardboard Genius series by Asch
Melvin Beederman, Superhero series by Trine
The Extraordinary Adventures of Ordinary Boy by Boniface
books by Scroggs
books by Rovetch
Shreddreman series by Van Draanen
books by Andy Griffiths
My Weird School and My Weird School Days by Gutman
Stink books by McDonald
Daniel Boom AKA Loud Boy/Adventures of Daniel Boom by Steinberg